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Which of the… (Class 12 Chemistry SQP 2023-24, Q1)

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ChemistryCBSE Class 12 · Sample paper, session 2023-24 · 1 mark · MCQ

CBSE Class 12 Chemistry sample paper 2023-24: question 1

From the official CBSE sample question paper for 2023-24, section A, question 1, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q1 · 1 mark · MCQElectrochemistry

Which of the following solutions will have the highest conductivity at 298 K?

  1. (A)0.01 M HCl solution
  2. (B)0.1 M HCl solution
  3. (C)0.01 M solution
  4. (D)0.1 M solution

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2023-24.

Hints

Open one hint at a time and try again before the next.

Hint 1

Compare a strong electrolyte with a weak one.

Hint 2

Conductivity (not molar conductivity) depends on the number of ions per cm³.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. HCl is a strong electrolyte (completely ionised), so it gives far more ions than weak .

  2. Conductivity depends on the number of ions per unit volume, so it falls on dilution. The more concentrated strong acid, 0.1 M HCl, therefore conducts best.

    1 mark

Answer: (B) 0.1 M HCl

Where the marks are

  • Chooses 0.1 M HCl because a strong electrolyte at higher concentration has more ions per unit volume (1 mark)

Revise the chapter

  • Chapter: Electrochemistry (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Electrochemistry, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2023-24: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.